Apple - How to make Google Chrome Helper not use as much CPU

Invoke ⋮ Chrome Menu → Window → Task Manager to see what exactly consumes CPU. Because the helper is a black box from the OS' side of view. I personally found a mining extension that way.

Also watch for ad content and ad blockers in an escalating war, endless refresh and block cycles.

Chrome, or any modern browser, is not so much directly or itself a problem here. Flash on the other hand is a problem in itself. If uninstalling system-wide Flash and the one that is embedded within Chrome are not an option, you should at least prohibit it from autoplay.

Misbehaving plugins or extensions might play a role too. Those mentioned by the OP are unfamiliar to me. Starting without them might lead to satisfactory results. They are certainly not needed on every site you visit. It may help to use different browsers or different profiles for one browser. One browser(-profile/account) for work, another one to ordinary surfing.

The main fault that drives this resource hog is on the web itself. On really old fashioned sites you will not see so much pressure on the rendering and javascript engines that are demanding so much CPU.

First line of defence against this is to block the grossly overused advertising and user profiling or user tracking that dominates almost every page out there. Any adblocker is of tremendous value here.

Second fault is mostly connected to ads as well but comes with a few additional nasties. Bad design on the pages themselves. That includes javascript abuse, bloated CSS, the Google enforced autoloading of additional content, dozens of cross site requests, big media elements. On most major sites you do not load a web page anymore. You load a bit of content that allows dozens of programs to execute around that.

To soften the resource usage of a browser it is necessary to

• reduce the number of extensions in the browser
• block ads,
• allow javascript only were it's strictly necessary for the core functionality of the sites you visit
• never to let anything autoplay

Since all these tips not only save your electricity bill and bandwidth everywhere they should also enhance your security and privacy.

So look for these search terms in Google's webstore: adblock, security, privacy and block. (follow the links and use the terms for a personal search in the extensions repository of your browser of choice.)

150% seems like an awfully high number, even for Chrome. I'd recommend disabling extensions and such temporarily and seeing if one of them is potentially causing the issue.

If, however, you find that nothing seems to work, you can limit the resources available to Chrome. Limiting the resources provided is pretty easy (provided you're willing to work with a little bit of third-party software.) You can use cputhrottle to limit the usage at the system level (better explained here.)